Vibrational frequency of Piezoelectric effect

In summary, when a piezoelectric material is subject to stress or voltage, it generates a vibrational frequency that can be determined using an oscilloscope. This frequency can also be used to determine the resonant and normal frequencies of the material. When applying a voltage, the detected frequency on the oscilloscope may be the resonant frequency or another form of frequency, and its relation to the voltage and resonant frequency can be studied. The quartz crystal is a commonly used piezo resonator with high impedance away from resonance and low impedance at resonance.
  • #1
ralden
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when a piezoelectric material experience a stress it generates voltage, and also when you applied voltage the piezo-material experience a vibrational frequency. Using oscilloscope we can determine the induced frequency of the piezo-material with respect to the applied voltage. Now given the dimensions of the material we can also determine the resonant/normal frequency of the material. My question is what is the frequency that detected by oscilloscope when you applied a voltage? is it the resonant frequency? or other form of frequency? then if so what is the relation of that detected frequency to the voltage and resonant frequency?
 
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  • #2
ralden said:
when a piezoelectric material experience a stress it generates voltage, and also when you applied voltage the piezo-material experience a vibrational frequency. Using oscilloscope we can determine the induced frequency of the piezo-material with respect to the applied voltage. Now given the dimensions of the material we can also determine the resonant/normal frequency of the material. My question is what is the frequency that detected by oscilloscope when you applied a voltage? is it the resonant frequency? or other form of frequency? then if so what is the relation of that detected frequency to the voltage and resonant frequency?
A typical piezo resonator is the quartz crystal. It behaves primarily like a very efficient series resonant LC circuit. Away from the resonant frequency it has high impedance, and at resonance it has low impedance. So if you excite the electrodes of the crystal with variable frequency coming from a signal generator, and measure the voltage across the plates with a CRO, there will be a sharp dip in voltage at resonance.
In practice there is also a nearby parallel resonance which arises from the capacitance of the electrodes in parallel with the reactance of the crystal, and a number of resonances arising from different mode of vibration.
 

1. What is the piezoelectric effect?

The piezoelectric effect is a phenomenon in which certain materials, such as crystals, ceramics, and biological materials, can generate an electric charge when subjected to mechanical stress or pressure. This effect is reversible, meaning these materials can also change shape or deform when an electric field is applied.

2. How is the vibrational frequency of the piezoelectric effect measured?

The vibrational frequency of the piezoelectric effect is typically measured using a device called a piezoelectric transducer. This transducer is connected to an electrical circuit and when a mechanical force is applied, it generates an electric charge with a specific frequency. This frequency can then be measured using a frequency meter or oscilloscope.

3. What factors affect the vibrational frequency of the piezoelectric effect?

The vibrational frequency of the piezoelectric effect is influenced by several factors, including the material properties of the piezoelectric material, the shape and size of the material, and the mechanical stress or pressure applied. Additionally, the temperature and humidity can also affect the frequency as they can alter the material properties and cause changes in the mechanical stress.

4. How is the piezoelectric effect used in technology?

The piezoelectric effect is used in a variety of technologies, including ultrasound imaging, sensors, actuators, and energy harvesting devices. In ultrasound imaging, the piezoelectric effect is used to generate and receive high-frequency sound waves for medical imaging. In sensors and actuators, the effect is used to convert mechanical energy into electrical signals and vice versa. In energy harvesting devices, the piezoelectric effect is used to convert mechanical energy from sources such as vibrations or pressure changes into electrical energy.

5. What are some common materials used in piezoelectric devices?

Some common materials used in piezoelectric devices include quartz, tourmaline, Rochelle salt, lead zirconate titanate (PZT), and polyvinylidene fluoride (PVDF). These materials have strong piezoelectric properties and can be found in various applications such as sensors, actuators, and energy harvesting devices. Additionally, certain biological materials such as bone, DNA, and some proteins also exhibit piezoelectric behavior and are being studied for potential use in technology.

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